CN110161304A - A kind of multiple thunder acts on the calculation method of lower leakage conductor absorption energy and residual voltage - Google Patents
A kind of multiple thunder acts on the calculation method of lower leakage conductor absorption energy and residual voltage Download PDFInfo
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Abstract
The invention discloses a kind of multiple thunders to act on the calculation method that lower leakage conductor absorbs energy and residual voltage.Current power transmission leakage conductor protects the calculating of validity and verifying only to consider that list fights back lightning stroke situation; however transmission line of electricity can suffer from multiple thunder namely more counterattack thunder and lightning lightning stroke process in actual motion; each counterattack Implantation Energy in arrester, the energy level that arrester absorbs at this time can exceed that single counterattack situation.The present invention is based on leakage conductor lightning stroke computation models, caused arrester resistor disc temperature rise is fought back by calculating each time, update the arrester absorption energy under subsequent counterattack and the VA characteristic curve in residual voltage calculating process, energy and comprehensive each counterattack clearance for insulation residual voltage are absorbed finally by the arrester under fighting back that adds up each time, arrester is obtained and absorbs energy and overall residual voltage.The present invention considers each influence fought back to arrester C-V characteristic, and the lower leakage conductors of thunder and lightning effect of fighting back can more precisely be calculated more and absorb energy and residual voltage.
Description
Technical field
The calculation method of leakage conductor absorption energy and residual voltage under being acted on the present invention relates to multiple thunder, specifically one
Kind acts on lower leakage conductor VA characteristic curve to multiple thunder and carries out the arrester absorption energy of dynamic adjustment, residual voltage calculating
Method.
Background technique
Power transmission line corridor condition is very severe, easily threatens by Lightning Disaster, and transmission line of electricity zinc oxide surge arresters are that have
The lightning protection measures of effect.In order to guarantee the validity of arrester protection, it is necessary to reasonably be divided the protective performance of arrester
Analysis.The analysis of arrester protective performance mainly includes that arrester absorbs whether energy exceeds whether design, residual voltage of arrester can be made
At protected insulator arc-over.
The arrester protective characteristic analysis under single counterattack has built up simulation model at present.However, in actual operation, it is defeated
There may be multiple subsequent counterattack namely multiple lightning stroke process for the lightning stroke that electric line is subjected to.Each order is fought back equal under multiple lightning stroke
The energy that arrester Implantation Energy, can may cause arrester absorption fights back lightning stroke situation far more than single, and arrester is inhaled at this time
Receive whether energy can be calculated and be analyzed beyond the energy limit value of leakage conductor.Due to the C-V characteristic of arrester
Be influenced by temperature it is larger, during multiple counterattack arrester resistor disc constant temperature rise cause each time fight back under taking shelter from the thunder
Device VA characteristic curve changes, and the calculation method of arrester absorption energy and residual voltage under existing thunder and lightning list counterattack is
It can not be applicable in.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the problems of the above-mentioned prior art, it is multiple to provide a kind of consideration
The arrester that lower leakage conductor VA characteristic curve dynamic adjusts that is struck by lightning absorbs energy, residual voltage calculation method, is based on route
Arrester lightning stroke computation model fights back caused arrester resistor disc temperature rise by calculating each time, updates keeping away under subsequent counterattack
Thunder device absorbs the VA characteristic curve in energy and residual voltage calculating process, and finally by adding up each time, the arrester under fighting back is inhaled
Energy and comprehensive each counterattack clearance for insulation residual voltage are received, the arrester under multiple counterattack is obtained and absorbs energy and overall residual voltage.
For this purpose, The technical solution adopted by the invention is as follows: a kind of multiple thunder, which acts on lower leakage conductor, absorbs energy and residual
The calculation method of pressure comprising following steps:
A) target shaft tower and line parameter circuit value are obtained, leakage conductor is established using EMTP (electromagnetic transient state procedure) software and is struck by lightning
Computation model；
B) it using the arrester resistor disc lightning impulse volt-ampere characteristic test under different temperatures, obtains target shaft tower route and keeps away
Relationship between thunder device C-V characteristic and resistor disc temperature；
C) amplitude of lightning current, the time interval ginseng of certain multiple main discharge for fighting back thunder and lightning and all previous subsequent counterattack are determined
Number, and corresponding environment temperature；
D) based on arrester VA characteristic curve under room temperature, the arrester C-V characteristic that is obtained using step b)
With the relationship of resistor disc temperature, this multiple arrester C-V characteristic fought back under thunder and lightning environment temperature is obtained；
E) the leakage conductor lightning stroke computation model established based on step a), with the arrester C-V characteristic under environment temperature
Lightning stroke emulation is carried out with main discharge amplitude of lightning current parameter, it is residual to calculate arrester absorption energy and arrester both ends under main discharge
Voltage crest value；
F) energy is absorbed according to arrester under the main discharge being calculated, based on arrester resistance tablet quality and compares thermal parameter
Calculate resistor disc temperature rise；
G) based on the arrester C-V characteristic under different temperatures, and it is special according to the volt-ampere that resistor disc temperature rise adjusts arrester
Property；
H) it according to the relationship of step b) obtained arrester C-V characteristic and resistor disc temperature, calculates then subsequent time primary
Arrester under hitting absorbs energy, arrester both ends residual voltage and resistor disc temperature rise；
I) g), h) step, the arrester being sequentially completed under all previous subsequent counterattack absorb energy and residual voltage calculating for repetition；
J) arrester under main discharge and each subsequent counterattack that adds up absorbs energy, the total absorption energy of acquisition arrester, and
Comprehensive main discharge and the corresponding arrester both ends residual voltage of each subsequent counterattack, arrester totality residual voltage is most during obtaining mostly counterattack
Big value.
The present invention is based on the arresters under single fight back to absorb energy and residual voltage computation model, considers to fight back lower arrester each time
The variation of C-V characteristic caused by resistor disc temperature rise absorbs energy to the leakage conductor under the effect of multiple thunder and residual voltage is counted
It calculates.
Further, in step a), the target shaft tower parameter of acquisition includes shaft tower model, exhales high, wave impedance and ground connection electricity
Resistance, line parameter circuit value include wire radius or sub-conductor radius, D.C. resistance, division number and oidiospore conductor spacing distance, conducting wire
Spatial position；Leakage conductor is struck by lightning computation model by steel tower, overhead line, DC power supply or three-phase alternating-current supply, thunder and lightning circulation
Road composition, thunderbolt conducting wire when emulation.
Further, in step b), leakage conductor C-V characteristic and resistor disc temperature TrRelationship are as follows:
U=f (I, Tr),
Expression is obtained by the arrester resistor disc volt-ampere characteristic test under different temperatures, and wherein U is to pass through thunder and lightning
Arrester both end voltage peak value when stream, I are lightning impulse current amplitude.
Further, in step c), multiple main discharge amplitude of lightning current, each subsequent counterattack lightning current width for fighting back thunder and lightning
Time interval parameter between value, main discharge and all previous subsequent counterattack is observed obtaining by lightning monitoring system.
Further, in step e), the waveform of lightning current chooses the Heilder type model based on double-exponential function, thunder
The electric current wave head time uses 2.6 μ s, and the lightning current wave rear time uses 50 μ s；Arrester absorbs the calculating public affairs of energy under main discharge
Formula is as follows:
In formula, Q is to absorb heat, and U (t) is that whole lightning protector bulk voltage changes over time function, utilizes leakage conductor thunder
It hits computation model to be calculated, I (t) is that arrester electric current changes over time function, utilizes leakage conductor lightning stroke computation model
It is calculated, T is the arrester resistor disc through-flow duration.
Further, in step f), energy, the temperature of arrester resistor disc are absorbed based on the arrester that step e) is calculated
It is as follows to rise calculation formula:
In formula, Q is to absorb heat, and n is resistor disc quantity in arrester, and c is resistor disc specific heat capacity, and m is single chip resistance piece
Quality, Δ t are resistor disc temperature rise.
Compared with traditional technology, the leakage conductor under the present invention can act on multiple thunder absorbs energy, residual voltage progress
It calculates, and considers each influence fought back to arrester C-V characteristic in calculating, ensure that and fight back route under thunders and lightnings act on more
The precision that arrester absorbs energy and residual voltage calculates.
Detailed description of the invention
Fig. 1 is the calculation flow chart in the embodiment of the present invention；
Fig. 2 is certain tower structure figure in application examples of the present invention；
Fig. 3 is the VA characteristic curve figure at 20 DEG C of leakage conductor that present invention calculating is related to.
Specific embodiment
The invention will be further described with specific embodiment with reference to the accompanying drawings of the specification.
Embodiment
A kind of multiple thunder as shown in Figure 1 acts on the calculation method that lower leakage conductor absorbs energy and residual voltage comprising
Following steps:
A) target shaft tower and line parameter circuit value are obtained, establishes leakage conductor lightning stroke computation model using EMTP software；
B) it using the arrester resistor disc lightning impulse volt-ampere characteristic test under different temperatures, obtains target shaft tower route and keeps away
Relationship between thunder device C-V characteristic and resistor disc temperature；
C) amplitude of lightning current, the time interval ginseng of certain multiple main discharge for fighting back thunder and lightning and all previous subsequent counterattack are determined
Number, and corresponding environment temperature；
D) based on arrester VA characteristic curve under room temperature, the arrester C-V characteristic that is obtained using step b)
With the relationship of resistor disc temperature, this multiple arrester C-V characteristic fought back under thunder and lightning environment temperature is obtained；
E) the leakage conductor lightning stroke computation model established based on step a), with the arrester C-V characteristic under environment temperature
Lightning stroke emulation is carried out with main discharge amplitude of lightning current parameter, it is residual to calculate arrester absorption energy and arrester both ends under main discharge
Voltage crest value；
F) energy is absorbed according to arrester under the main discharge being calculated, based on arrester resistance tablet quality and compares thermal parameter
Calculate resistor disc temperature rise；
G) based on the arrester C-V characteristic under different temperatures, and it is special according to the volt-ampere that resistor disc temperature rise adjusts arrester
Property；
H) it according to the relationship of step b) obtained arrester C-V characteristic and resistor disc temperature, calculates then subsequent time primary
Arrester under hitting absorbs energy, arrester both ends residual voltage and resistor disc temperature rise；
I) g), h) step, the arrester being sequentially completed under all previous subsequent counterattack absorb energy and residual voltage calculating for repetition；
J) arrester under main discharge and each subsequent counterattack that adds up absorbs energy, the total absorption energy of acquisition arrester, and
Comprehensive main discharge and the corresponding arrester both ends residual voltage of each subsequent counterattack, arrester totality residual voltage is most during obtaining mostly counterattack
Big value.
In step a), the target shaft tower parameter of acquisition includes shaft tower model, exhales high, wave impedance and ground resistance, route ginseng
Number includes wire radius or sub-conductor radius, D.C. resistance, division number and oidiospore conductor spacing distance, cable space position；
Leakage conductor lightning stroke computation model is made of steel tower, overhead line, DC power supply or three-phase alternating-current supply, thunder and lightning circulation road, is imitated
Thunderbolt conducting wire when true.
In step b), the leakage conductor C-V characteristic and resistor disc temperature TrRelationship are as follows:
U=f (I, Tr)
Expression is obtained by the arrester resistor disc volt-ampere characteristic test under different temperatures, and wherein U is to pass through thunder and lightning
Arrester both end voltage peak value when stream, I are lightning impulse current amplitude.
In step c), multiple main discharge amplitude of lightning current, each subsequent counterattack amplitude of lightning current, the main discharge for fighting back thunder and lightning
And the time interval parameter between all previous subsequent counterattack is observed obtaining by lightning monitoring system.
In step e), the waveform of lightning current chooses the Heilder type model based on double-exponential function, lightning current wave head
Time uses 2.6 μ s, and the lightning current wave rear time uses 50 μ s；Arrester absorbs the following institute of calculation formula of energy under main discharge
Show:
In formula, Q is to absorb heat, and U (t) is that whole lightning protector bulk voltage changes over time function, and I (t) is arrester electric current
Function is changed over time, T is the arrester resistor disc through-flow duration.
In step f), energy is absorbed based on the arrester that step e) is calculated, the temperature rise of arrester resistor disc calculates public
Formula is as follows:
In formula, Q is to absorb heat, and n is resistor disc quantity in arrester, and c is resistor disc specific heat capacity, and m is single chip resistance piece
Quality, Δ t are resistor disc temperature rise.
Application examples
By taking the primary typical multiple lightning stroke of certain UHVDC Transmission Lines as an example, energy is absorbed to leakage conductor under multiple lightning stroke
Amount and residual voltage are calculated, the specific steps are as follows:
1. obtaining shaft tower and line parameter circuit value, tower structure form being shown in Fig. 2, leakage conductor lightning stroke is built in EMTP software
Computation model, power supply selection ± 800kV working voltage source model, route choosing LCC circuit model, shaft tower select more wave impedance
Model, and each model parameter is set.
2. the lightning impulse C-V characteristic at a temperature of carrying out different resistor discs to target line arrester is tested, obtains 20 and take the photograph
Arrester VA characteristic curve under family name's degree is as shown in figure 3, arrester VA characteristic curve curve shown in Fig. 3 at a temperature of remaining
On the basis of be corrected, arrester resistor disc voltage temperature coefficient be ﹢ 0.119%/DEG C, i.e., resistor disc temperature it is every increase by 1 DEG C,
When arrester is by identical amplitude lightning current, both end voltage increases by 0.119%.
3. it is as shown in table 1 to check in main discharge and subsequent counterattack amplitude of lightning current, corresponding moment in lightning monitoring system.Together
When according to meteorological data, obtaining failure shaft tower environment temperature is 20 DEG C.
Certain typical multiple parameter of lightning strike of 1 extra-high voltage direct-current of table
| Time | Amplitude | Description |
| 2017-06-11 12:51:23.663 | -66.1 | Main discharge (contains 4 subsequent counterattacks) |
| 2017-06-11 12:51:23.685 | -41.4 | Subsequent 1st counterattack |
| 2017-06-11 12:51:23.914 | -36.3 | Subsequent 2nd counterattack |
| 2017-06-11 12:51:23.967 | -13.4 | Subsequent 3rd counterattack |
| 2017-06-11 12:51:24.006 | -10.4 | Subsequent the 4th is fought back |
4. at a temperature of leakage conductor local environment, C-V characteristic directlys adopt Fig. 3 data.
5. based on leakage conductor lightning stroke computation model, with the arrester C-V characteristic under environment temperature, main discharge thunder and lightning
Stream parameter carries out lightning stroke simulation calculation, calculates lightning current peak value, arrester that arrester resistor disc passes through and absorbs energy, takes shelter from the thunder
Device both ends residual voltage.Wherein main discharge lightning current waveform is 2.6/50 μ s, arrester resistor disc diameter 0.078m, thickness
0.0225m.Calculated result is as shown in table 2.
The multiple lightning stroke main discharge simulation result of table 2
6. absorbing energy according to the arrester being calculated, arrester resistance tablet quality is based on, than thermal parameter, according to formula
(1) resistor disc temperature rise is calculated, wherein resistor disc density is 5.57 × 103kg/m3, specific heat capacity is 0.5kJ/ (kg DEG C), through counting
Calculating the resistor disc temperature rise under main discharge lightning current is 56.6 DEG C.
7. based on the arrester C-V characteristic under different temperatures, and it is special according to the volt-ampere that resistor disc temperature rise adjusts arrester
Property, the VA characteristic curve obtained at 76.6 DEG C of resistor disc is as shown in Figure 3.
8. according to VA characteristic curve adjusted, calculated for subsequent for the first time fight back when arrester resistor disc it is through-flow, inhale
Receive energy, clearance for insulation overvoltage and resistor disc temperature rise.
9. repeat step 7.-step 8., be sequentially completed that arrester under all previous subsequent counterattack absorbs energy and residual voltage calculates.
Main discharge subsequent fight back corresponding arrester and absorbs that energy, resistor disc temperature rise, the results are shown in Table 3 for residual voltage of arrester for each time.
The 3 multiple lightning stroke simulation result of typical case of table (C-V characteristic temperature coefficient ﹢ 0.119%/DEG C)
10. arrester absorbs energy under all previous lightning stroke that adds up, obtains this multiple thunder and act on the total absorption of lower leakage conductor
Energy is 6079kJ, arrester both ends residual voltage under comprehensive main discharge and the subsequent counterattack of each order, is obtained under this multiple thunder effect
Leakage conductor residual voltage maximum value is 1930kV.
Above embodiment is described some details of the invention, but should not be understood as to of the invention
Limitation, those skilled in the art without departing from the principle and spirit of the present invention within the scope of the invention can be with
It is changed, is modified, replacement and variant.
Claims (6)
1. a kind of multiple thunder acts on the calculation method that lower leakage conductor absorbs energy and residual voltage, which is characterized in that comprising steps of
A) target shaft tower and line parameter circuit value are obtained, establishes leakage conductor lightning stroke computation model using EMTP software；
B) using the arrester resistor disc lightning impulse volt-ampere characteristic test under different temperatures, target shaft tower leakage conductor is obtained
Relationship between C-V characteristic and resistor disc temperature；
C) amplitude of lightning current, the time interval parameter of certain multiple main discharge for fighting back thunder and lightning and all previous subsequent counterattack are determined, with
And corresponding environment temperature；
D) based on arrester VA characteristic curve under room temperature, the obtained arrester C-V characteristic of step b) and electricity are utilized
The relationship for hindering piece temperature obtains this multiple arrester C-V characteristic fought back under thunder and lightning environment temperature；
E) based on step a) establish leakage conductor be struck by lightning computation model, under environment temperature arrester C-V characteristic and master
Electric discharge amplitude of lightning current parameter carries out lightning stroke emulation, calculates arrester under main discharge and absorbs energy and arrester both ends residual voltage peak
Value；
F) energy is absorbed according to arrester under the main discharge being calculated, is calculated based on arrester resistance tablet quality and than thermal parameter
Resistor disc temperature rise；
G) based on the arrester C-V characteristic under different temperatures, and according to the C-V characteristic of resistor disc temperature rise adjustment arrester；
H) it according to the relationship of step b) obtained arrester C-V characteristic and resistor disc temperature, calculates under then primary subsequent counterattack
Arrester absorb energy, arrester both ends residual voltage and resistor disc temperature rise；
I) g), h) step, the arrester being sequentially completed under all previous subsequent counterattack absorb energy and residual voltage calculating for repetition；
J) arrester under main discharge and each subsequent counterattack that adds up absorbs energy, obtains the total absorption energy of arrester, and integrate
Main discharge and the corresponding arrester both ends residual voltage of each subsequent counterattack, obtain arrester totality residual voltage maximum value during fight back more.
2. multiple thunder according to claim 1 acts on the calculation method that lower leakage conductor absorbs energy and residual voltage, special
Sign is, in step a), the target shaft tower parameter of acquisition includes shaft tower model, exhales high, wave impedance and ground resistance, line parameter circuit value
Including wire radius or sub-conductor radius, D.C. resistance, division number and oidiospore conductor spacing distance, cable space position；Line
Arrester lightning stroke computation model in road is made of steel tower, overhead line, DC power supply or three-phase alternating-current supply, thunder and lightning circulation road, is emulated
When thunderbolt conducting wire.
3. multiple thunder according to claim 1 acts on the calculation method that lower leakage conductor absorbs energy and residual voltage, special
Sign is, in step b), the leakage conductor C-V characteristic and resistor disc temperature TrRelationship are as follows:
U=f (I, Tr)
Expression is obtained by the arrester resistor disc volt-ampere characteristic test under different temperatures, and wherein U is when passing through lightning current
Arrester both end voltage peak value, I are lightning impulse current amplitude.
4. multiple thunder according to claim 1 acts on the calculation method that lower leakage conductor absorbs energy and residual voltage, special
Sign is, in step c), multiple main discharge amplitude of lightning current, each subsequent counterattack amplitude of lightning current, the main discharge for fighting back thunder and lightning
And the time interval parameter between all previous subsequent counterattack is observed obtaining by lightning monitoring system.
5. multiple thunder according to claim 1 acts on the calculation method that lower leakage conductor absorbs energy and residual voltage, special
Sign is, in step e), the waveform of lightning current chooses the Heilder type model based on double-exponential function, when lightning current wave head
Between use 2.6 μ s, the lightning current wave rear time use 50 μ s；The calculation formula of arrester absorption energy is as follows under main discharge:
In formula, Q is to absorb heat, and U (t) is that whole lightning protector bulk voltage changes over time function, I (t) be arrester electric current at any time
Between change function, T is the arrester resistor disc through-flow duration.
6. multiple thunder according to claim 1 acts on the calculation method that lower leakage conductor absorbs energy and residual voltage, special
Sign is, in step f), absorbs energy, the temperature rise calculation formula of arrester resistor disc based on the arrester that step e) is calculated
It is as follows:
In formula, Q is to absorb heat, and n is resistor disc quantity in arrester, and c is resistor disc specific heat capacity, and m is single chip resistance tablet quality,
Δ t is resistor disc temperature rise.
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| CN111983360A (en) * | 2020-08-24 | 2020-11-24 | 西南交通大学 | Transmission tower safety risk evaluation system considering multiple lightning strokes |
| CN112380808A (en) * | 2020-11-02 | 2021-02-19 | 三峡大学 | Method for calculating temperature rise of lightning arrester under multiple back-striking action of long continuous current |
| CN112798853A (en) * | 2020-12-28 | 2021-05-14 | 广东电网有限责任公司电力科学研究院 | Assessment method for lightning invasion wave level of substation electrical equipment for resisting continuous lightning stroke |
| CN114113835A (en) * | 2021-11-10 | 2022-03-01 | 西南交通大学 | Method for evaluating energy absorption performance of porcelain-sheathed lightning arrester under multiple lightning strike discharge |
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